package com.ssh.demo.jschsshdemo.exec;

/* -*-mode:java; c-basic-offset:2; indent-tabs-mode:nil -*- */
/**
 * This program will demonstrate remote exec.
 * $ CLASSPATH=.:../build javac Exec.java
 * $ CLASSPATH=.:../build java Exec
 * You will be asked username, hostname, displayname, passwd and command.
 * If everything works fine, given command will be invoked
 * on the remote side and outputs will be printed out.
 */

import com.jcraft.jsch.*;

import java.awt.*;
import javax.swing.*;
import java.io.*;

public class Exec {

    public static void main(String[] arg) {
        try {
            JSch jsch = new JSch();

            String host = "10.211.55.3";
//            if (arg.length > 0) {
//                host = arg[0];
//            } else {
//                host = JOptionPane.showInputDialog("Enter username@hostname",
//                        System.getProperty("user.name") +
//                                "@localhost");
//            }
//            String user = host.substring(0, host.indexOf('@'));
//            host = host.substring(host.indexOf('@') + 1);
            String user = "root";
            Session session = jsch.getSession(user, host, 22);

            UserInfo ui = new MyUserInfo();
            session.setUserInfo(ui);
            session.connect();

//            String command = JOptionPane.showInputDialog("Enter command",
//                    "set|grep SSH");
            String command ="ls -al";

                    Channel channel = session.openChannel("exec");
            ((ChannelExec) channel).setCommand(command);

            //channel.setInputStream(System.in);
            channel.setInputStream(null);

            //channel.setOutputStream(System.out);

            //FileOutputStream fos=new FileOutputStream("/tmp/stderr");
            //((ChannelExec)channel).setErrStream(fos);
            ((ChannelExec) channel).setErrStream(System.err);

            InputStream in = channel.getInputStream();

            channel.connect();

            byte[] tmp = new byte[1024];
            while (true) {
                while (in.available() > 0) {
                    int i = in.read(tmp, 0, 1024);
                    if (i < 0) {
                        break;
                    }
                    System.out.print(new String(tmp, 0, i));
                }
                if (channel.isClosed()) {
                    if (in.available() > 0) {
                        continue;
                    }
                    System.out.println("exit-status: " + channel.getExitStatus());
                    break;
                }
                try {
                    Thread.sleep(1000);
                } catch (Exception ee) {
                }
            }
            channel.disconnect();
            session.disconnect();
        } catch (Exception e) {
            System.out.println(e);
        }
    }

    public static class MyUserInfo implements UserInfo, UIKeyboardInteractive {
        @Override
        public String getPassword() {
            return passwd;
        }

        @Override
        public boolean promptYesNo(String str) {
//            Object[] options = {"yes", "no"};
//            int foo = JOptionPane.showOptionDialog(null,
//                    str,
//                    "Warning",
//                    JOptionPane.DEFAULT_OPTION,
//                    JOptionPane.WARNING_MESSAGE,
//                    null, options, options[0]);
//            return foo == 0;
            return true;
        }

        String passwd = "root";
        JTextField passwordField = (JTextField) new JPasswordField(20);

        @Override
        public String getPassphrase() {
            return null;
        }

        @Override
        public boolean promptPassphrase(String message) {
            return true;
        }

        @Override
        public boolean promptPassword(String message) {
//            Object[] ob = {passwordField};
//            int result =
//                    JOptionPane.showConfirmDialog(null, ob, message,
//                            JOptionPane.OK_CANCEL_OPTION);
//            if (result == JOptionPane.OK_OPTION) {
//                passwd = passwordField.getText();
//                return true;
//            } else {
//                return false;
//            }
            return true;
        }

        @Override
        public void showMessage(String message) {
            //JOptionPane.showMessageDialog(null, message);
        }

        final GridBagConstraints gbc =
                new GridBagConstraints(0, 0, 1, 1, 1, 1,
                        GridBagConstraints.NORTHWEST,
                        GridBagConstraints.NONE,
                        new Insets(0, 0, 0, 0), 0, 0);
        private Container panel;

        @Override
        public String[] promptKeyboardInteractive(String destination,
                                                  String name,
                                                  String instruction,
                                                  String[] prompt,
                                                  boolean[] echo) {
            panel = new JPanel();
            panel.setLayout(new GridBagLayout());

            gbc.weightx = 1.0;
            gbc.gridwidth = GridBagConstraints.REMAINDER;
            gbc.gridx = 0;
            panel.add(new JLabel(instruction), gbc);
            gbc.gridy++;

            gbc.gridwidth = GridBagConstraints.RELATIVE;

            JTextField[] texts = new JTextField[prompt.length];
            for (int i = 0; i < prompt.length; i++) {
                gbc.fill = GridBagConstraints.NONE;
                gbc.gridx = 0;
                gbc.weightx = 1;
                panel.add(new JLabel(prompt[i]), gbc);

                gbc.gridx = 1;
                gbc.fill = GridBagConstraints.HORIZONTAL;
                gbc.weighty = 1;
                if (echo[i]) {
                    texts[i] = new JTextField(20);
                } else {
                    texts[i] = new JPasswordField(20);
                }
                panel.add(texts[i], gbc);
                gbc.gridy++;
            }

//            if (JOptionPane.showConfirmDialog(null, panel,
//                    destination + ": " + name,
//                    JOptionPane.OK_CANCEL_OPTION,
//                    JOptionPane.QUESTION_MESSAGE)
//                    == JOptionPane.OK_OPTION) {
//                String[] response = new String[prompt.length];
//                for (int i = 0; i < prompt.length; i++) {
//                    response[i] = texts[i].getText();
//                }
//                return response;
//            } else {
                return null;  // cancel
//            }
        }
    }
}
